LMT MRP-H QUAD | 12.5" Upper Receiver

The LMT MRP-H QUAD 12.5 Upper Receiver is designed for use with large-frame rifle platforms and is compatible with calibers such as 7.62×51 (.308) and 6.5 Creedmoor when paired with an appropriate LMT barrel assembly. Built around LMT’s Monolithic Rail Platform (MRP™), the upper receiver and handguard are machined from a single piece of forged aluminum, creating a rigid platform for mounting optics and accessories. The design utilizes a proprietary barrel retention system secured by two locking bolts, allowing barrel installation or removal using a standard T-30 Torx tool.

This upper features a quad rail configuration with full-length Picatinny rails for accessory attachment at the 12, 3, 6, and 9 o’clock positions. It is designed specifically for use with LMT monolithic barrel assemblies and supports multiple large-caliber options within the MRP-H system. The upper receiver is sold without a barrel, allowing users to configure their setup based on caliber and application requirements.

Specifications

• Platform: MRP-H (Heavy)
• Caliber Compatibility: 7.62×51 (.308), 6.5 Creedmoor (with compatible barrel)
• Construction: Monolithic forged aluminum receiver and handguard
• Barrel System: Proprietary LMT quick-change barrel system (barrel not included)
• Rail Type: Quad Picatinny rails (12, 3, 6, 9 o’clock)
• Top Rail Length: 19.25 inches
• Side/Bottom Rail Length: 9 inches
• Tool Requirement: T-30 Torx wrench for barrel installation
• Weight: Approx. 2.116 lbs
• Barrel Compatibility: LMT monolithic barrel assemblies only